Hi List,I'm trying to create a kind of threshold effect, but I'm very new to CI coding. Here's what I'm trying to achieve:
-I need to change all pixels under a certain brightness value to black.- And remap the brightness of the remain pixels to a 0 to 1 range (so I get contrast even on high threshold values).
- It doesn't matter if the resulting output is grayscale, I don't need the color information.
It is definitely not working right now so I need your help :) Here's the code I've got for now (and I've attached the simple patch)
test_threshold.qtz
Description: application/quartzcomposer
:
kernel vec4 threshhold(sampler image, float threshold)
{
vec4 newpix = sample(image, samplerCoord(image));
vec4 newpix = (newpix - threshold) / (1.0-threshold*1.1);
newpix.a = 1.0;
return vec4 (newpix);
}
_______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
